avpacket: use AVBuffer to allow refcounting the packets.

This will allow us to avoid copying the packets in many cases.

This breaks ABI.

libavcodec/avcodec.h

@@ -29,6 +29,7 @@
 #include <errno.h>
 #include "libavutil/samplefmt.h"
 #include "libavutil/avutil.h"
+#include "libavutil/buffer.h"
 #include "libavutil/cpu.h"
 #include "libavutil/dict.h"
 #include "libavutil/log.h"
@@ -892,17 +893,23 @@ enum AVPacketSideDataType {
  * ABI. Thus it may be allocated on stack and no new fields can be added to it
  * without libavcodec and libavformat major bump.
  *
- * The semantics of data ownership depends on the destruct field.
- * If it is set, the packet data is dynamically allocated and is valid
- * indefinitely until av_free_packet() is called (which in turn calls the
- * destruct callback to free the data). If destruct is not set, the packet data
- * is typically backed by some static buffer somewhere and is only valid for a
- * limited time (e.g. until the next read call when demuxing).
+ * The semantics of data ownership depends on the buf or destruct (deprecated)
+ * fields. If either is set, the packet data is dynamically allocated and is
+ * valid indefinitely until av_free_packet() is called (which in turn calls
+ * av_buffer_unref()/the destruct callback to free the data). If neither is set,
+ * the packet data is typically backed by some static buffer somewhere and is
+ * only valid for a limited time (e.g. until the next read call when demuxing).
  *
  * The side data is always allocated with av_malloc() and is freed in
  * av_free_packet().
  */
 typedef struct AVPacket {
+    /**
+     * A reference to the reference-counted buffer where the packet data is
+     * stored.
+     * May be NULL, then the packet data is not reference-counted.
+     */
+    AVBufferRef *buf;
     /**
      * Presentation timestamp in AVStream->time_base units; the time at which
      * the decompressed packet will be presented to the user.
@@ -942,8 +949,12 @@ typedef struct AVPacket {
      * Equals next_pts - this_pts in presentation order.
      */
     int   duration;
+#if FF_API_DESTRUCT_PACKET
+    attribute_deprecated
     void  (*destruct)(struct AVPacket *);
+    attribute_deprecated
     void  *priv;
+#endif
     int64_t pos;                            ///< byte position in stream, -1 if unknown
 
     /**
@@ -3413,10 +3424,14 @@ void avsubtitle_free(AVSubtitle *sub);
  * @{
  */
 
+#if FF_API_DESTRUCT_PACKET
 /**
  * Default packet destructor.
+ * @deprecated use the AVBuffer API instead
  */
+attribute_deprecated
 void av_destruct_packet(AVPacket *pkt);
+#endif
 
 /**
  * Initialize optional fields of a packet with default values.
@@ -3454,6 +3469,21 @@ void av_shrink_packet(AVPacket *pkt, int size);
  */
 int av_grow_packet(AVPacket *pkt, int grow_by);
 
+/**
+ * Initialize a reference-counted packet from av_malloc()ed data.
+ *
+ * @param pkt packet to be initialized. This function will set the data, size,
+ *        buf and destruct fields, all others are left untouched.
+ * @param data Data allocated by av_malloc() to be used as packet data. If this
+ *        function returns successfully, the data is owned by the underlying AVBuffer.
+ *        The caller may not access the data through other means.
+ * @param size size of data in bytes, without the padding. I.e. the full buffer
+ *        size is assumed to be size + FF_INPUT_BUFFER_PADDING_SIZE.
+ *
+ * @return 0 on success, a negative AVERROR on error
+ */
+int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
+
 /**
  * @warning This is a hack - the packet memory allocation stuff is broken. The
  * packet is allocated if it was not really allocated.

libavcodec/avpacket.c

@@ -22,9 +22,11 @@
 #include <string.h>
 
 #include "libavutil/avassert.h"
+#include "libavutil/common.h"
 #include "libavutil/mem.h"
 #include "avcodec.h"
 
+#if FF_API_DESTRUCT_PACKET
 void av_destruct_packet(AVPacket *pkt)
 {
     av_free(pkt->data);
@@ -32,6 +34,14 @@ void av_destruct_packet(AVPacket *pkt)
     pkt->size = 0;
 }
 
+/* a dummy destruct callback for the callers that assume AVPacket.destruct ==
+ * NULL => static data */
+static void dummy_destruct_packet(AVPacket *pkt)
+{
+    av_assert0(0);
+}
+#endif
+
 void av_init_packet(AVPacket *pkt)
 {
     pkt->pts                  = AV_NOPTS_VALUE;
@@ -41,27 +51,35 @@ void av_init_packet(AVPacket *pkt)
     pkt->convergence_duration = 0;
     pkt->flags                = 0;
     pkt->stream_index         = 0;
+#if FF_API_DESTRUCT_PACKET
     pkt->destruct             = NULL;
+#endif
+    pkt->buf                  = NULL;
     pkt->side_data            = NULL;
     pkt->side_data_elems      = 0;
 }
 
 int av_new_packet(AVPacket *pkt, int size)
 {
-    uint8_t *data = NULL;
-    if ((unsigned)size < (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
-        data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
-    if (data) {
-        memset(data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
-    } else
-        size = 0;
+    AVBufferRef *buf = NULL;
+
+    if ((unsigned)size >= (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
+        return AVERROR(EINVAL);
+
+    av_buffer_realloc(&buf, size + FF_INPUT_BUFFER_PADDING_SIZE);
+    if (!buf)
+        return AVERROR(ENOMEM);
+
+    memset(buf->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
 
     av_init_packet(pkt);
-    pkt->data     = data;
+    pkt->buf      = buf;
+    pkt->data     = buf->data;
     pkt->size     = size;
-    pkt->destruct = av_destruct_packet;
-    if (!data)
-        return AVERROR(ENOMEM);
+#if FF_API_DESTRUCT_PACKET
+    pkt->destruct = dummy_destruct_packet;
+#endif
+
     return 0;
 }
 
@@ -75,33 +93,71 @@ void av_shrink_packet(AVPacket *pkt, int size)
 
 int av_grow_packet(AVPacket *pkt, int grow_by)
 {
-    void *new_ptr;
+    int new_size;
     av_assert0((unsigned)pkt->size <= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE);
     if (!pkt->size)
         return av_new_packet(pkt, grow_by);
     if ((unsigned)grow_by >
         INT_MAX - (pkt->size + FF_INPUT_BUFFER_PADDING_SIZE))
         return -1;
-    new_ptr = av_realloc(pkt->data,
-                         pkt->size + grow_by + FF_INPUT_BUFFER_PADDING_SIZE);
-    if (!new_ptr)
-        return AVERROR(ENOMEM);
-    pkt->data  = new_ptr;
+
+    new_size = pkt->size + grow_by + FF_INPUT_BUFFER_PADDING_SIZE;
+    if (pkt->buf) {
+        int ret = av_buffer_realloc(&pkt->buf, new_size);
+        if (ret < 0)
+            return ret;
+    } else {
+        pkt->buf = av_buffer_alloc(new_size);
+        if (!pkt->buf)
+            return AVERROR(ENOMEM);
+        memcpy(pkt->buf->data, pkt->data, FFMIN(pkt->size, pkt->size + grow_by));
+#if FF_API_DESTRUCT_PACKET
+        pkt->destruct = dummy_destruct_packet;
+#endif
+    }
+    pkt->data  = pkt->buf->data;
     pkt->size += grow_by;
     memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
+
     return 0;
 }
 
-#define DUP_DATA(dst, src, size, padding)                               \
+int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size)
+{
+    if (size >= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
+        return AVERROR(EINVAL);
+
+    pkt->buf = av_buffer_create(data, size + FF_INPUT_BUFFER_PADDING_SIZE,
+                                av_buffer_default_free, NULL, 0);
+    if (!pkt->buf)
+        return AVERROR(ENOMEM);
+
+    pkt->data = data;
+    pkt->size = size;
+#if FF_API_DESTRUCT_PACKET
+    pkt->destruct = dummy_destruct_packet;
+#endif
+
+    return 0;
+}
+
+#define ALLOC_MALLOC(data, size) data = av_malloc(size)
+#define ALLOC_BUF(data, size)                \
+do {                                         \
+    av_buffer_realloc(&pkt->buf, size);      \
+    data = pkt->buf ? pkt->buf->data : NULL; \
+} while (0)
+
+#define DUP_DATA(dst, src, size, padding, ALLOC)                        \
     do {                                                                \
         void *data;                                                     \
         if (padding) {                                                  \
             if ((unsigned)(size) >                                      \
                 (unsigned)(size) + FF_INPUT_BUFFER_PADDING_SIZE)        \
                 goto failed_alloc;                                      \
-            data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);      \
+            ALLOC(data, size + FF_INPUT_BUFFER_PADDING_SIZE);           \
         } else {                                                        \
-            data = av_malloc(size);                                     \
+            ALLOC(data, size);                                          \
         }                                                               \
         if (!data)                                                      \
             goto failed_alloc;                                          \
@@ -116,30 +172,36 @@ int av_dup_packet(AVPacket *pkt)
 {
     AVPacket tmp_pkt;
 
-    if (pkt->destruct == NULL && pkt->data) {
+    if (!pkt->buf && pkt->data
+#if FF_API_DESTRUCT_PACKET
+        && !pkt->destruct
+#endif
+        ) {
         tmp_pkt = *pkt;
 
         pkt->data      = NULL;
         pkt->side_data = NULL;
-        DUP_DATA(pkt->data, tmp_pkt.data, pkt->size, 1);
-        pkt->destruct = av_destruct_packet;
+        DUP_DATA(pkt->data, tmp_pkt.data, pkt->size, 1, ALLOC_BUF);
+#if FF_API_DESTRUCT_PACKET
+        pkt->destruct = dummy_destruct_packet;
+#endif
 
         if (pkt->side_data_elems) {
             int i;
 
             DUP_DATA(pkt->side_data, tmp_pkt.side_data,
-                     pkt->side_data_elems * sizeof(*pkt->side_data), 0);
+                     pkt->side_data_elems * sizeof(*pkt->side_data), 0, ALLOC_MALLOC);
             memset(pkt->side_data, 0,
                    pkt->side_data_elems * sizeof(*pkt->side_data));
             for (i = 0; i < pkt->side_data_elems; i++)
                 DUP_DATA(pkt->side_data[i].data, tmp_pkt.side_data[i].data,
-                         tmp_pkt.side_data[i].size, 1);
+                         tmp_pkt.side_data[i].size, 1, ALLOC_MALLOC);
         }
     }
     return 0;
 
 failed_alloc:
-    av_destruct_packet(pkt);
+    av_free_packet(pkt);
     return AVERROR(ENOMEM);
 }
 
@@ -148,8 +210,13 @@ void av_free_packet(AVPacket *pkt)
     if (pkt) {
         int i;
 
-        if (pkt->destruct)
+        if (pkt->buf)
+            av_buffer_unref(&pkt->buf);
+#if FF_API_DESTRUCT_PACKET
+        else if (pkt->destruct)
             pkt->destruct(pkt);
+        pkt->destruct = NULL;
+#endif
         pkt->data            = NULL;
         pkt->size            = 0;
 

libavcodec/utils.c

@@ -887,13 +887,19 @@ int ff_alloc_packet(AVPacket *avpkt, int size)
         return AVERROR(EINVAL);
 
     if (avpkt->data) {
+        AVBufferRef *buf = avpkt->buf;
+#if FF_API_DESTRUCT_PACKET
         void *destruct = avpkt->destruct;
+#endif
 
         if (avpkt->size < size)
             return AVERROR(EINVAL);
 
         av_init_packet(avpkt);
+#if FF_API_DESTRUCT_PACKET
         avpkt->destruct = destruct;
+#endif
+        avpkt->buf      = buf;
         avpkt->size     = size;
         return 0;
     } else {
@@ -1020,9 +1026,9 @@ int attribute_align_arg avcodec_encode_audio2(AVCodecContext *avctx,
         }
 
         if (!user_packet && avpkt->size) {
-            uint8_t *new_data = av_realloc(avpkt->data, avpkt->size);
-            if (new_data)
-                avpkt->data = new_data;
+            ret = av_buffer_realloc(&avpkt->buf, avpkt->size);
+            if (ret >= 0)
+                avpkt->data = avpkt->buf->data;
         }
 
         avctx->frame_number++;
@@ -1197,9 +1203,9 @@ int attribute_align_arg avcodec_encode_video2(AVCodecContext *avctx,
             avpkt->pts = avpkt->dts = frame->pts;
 
         if (!user_packet && avpkt->size) {
-            uint8_t *new_data = av_realloc(avpkt->data, avpkt->size);
-            if (new_data)
-                avpkt->data = new_data;
+            ret = av_buffer_realloc(&avpkt->buf, avpkt->size);
+            if (ret >= 0)
+                avpkt->data = avpkt->buf->data;
         }
 
         avctx->frame_number++;

libavcodec/version.h

@@ -100,5 +100,8 @@
 #ifndef FF_API_DEINTERLACE
 #define FF_API_DEINTERLACE       (LIBAVCODEC_VERSION_MAJOR < 56)
 #endif
+#ifndef FF_API_DESTRUCT_PACKET
+#define FF_API_DESTRUCT_PACKET   (LIBAVCODEC_VERSION_MAJOR < 56)
+#endif
 
 #endif /* AVCODEC_VERSION_H */

libavdevice/v4l2.c

@@ -42,6 +42,8 @@
 #else
 #include <linux/videodev2.h>
 #endif
+#include "libavutil/atomic.h"
+#include "libavutil/avassert.h"
 #include "libavutil/imgutils.h"
 #include "libavutil/log.h"
 #include "libavutil/opt.h"
@@ -67,6 +69,7 @@ struct video_data {
     int top_field_first;
 
     int buffers;
+    volatile int buffers_queued;
     void **buf_start;
     unsigned int *buf_len;
     char *standard;
@@ -79,6 +82,7 @@ struct video_data {
 };
 
 struct buff_data {
+    struct video_data *s;
     int index;
     int fd;
 };
@@ -405,14 +409,19 @@ static int mmap_init(AVFormatContext *ctx)
     return 0;
 }
 
-static void mmap_release_buffer(AVPacket *pkt)
+#if FF_API_DESTRUCT_PACKET
+static void dummy_release_buffer(AVPacket *pkt)
+{
+    av_assert0(0);
+}
+#endif
+
+static void mmap_release_buffer(void *opaque, uint8_t *data)
 {
     struct v4l2_buffer buf = { 0 };
     int res, fd;
-    struct buff_data *buf_descriptor = pkt->priv;
-
-    if (pkt->data == NULL)
-        return;
+    struct buff_data *buf_descriptor = opaque;
+    struct video_data *s = buf_descriptor->s;
 
     buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
     buf.memory = V4L2_MEMORY_MMAP;
@@ -424,9 +433,7 @@ static void mmap_release_buffer(AVPacket *pkt)
     if (res < 0)
         av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n",
                strerror(errno));
-
-    pkt->data = NULL;
-    pkt->size = 0;
+    avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1);
 }
 
 static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
@@ -436,7 +443,6 @@ static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
         .type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
         .memory = V4L2_MEMORY_MMAP
     };
-    struct buff_data *buf_descriptor;
     struct pollfd p = { .fd = s->fd, .events = POLLIN };
     int res;
 
@@ -465,6 +471,9 @@ static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
         av_log(ctx, AV_LOG_ERROR, "Invalid buffer index received.\n");
         return AVERROR(EINVAL);
     }
+    avpriv_atomic_int_add_and_fetch(&s->buffers_queued, -1);
+    // always keep at least one buffer queued
+    av_assert0(avpriv_atomic_int_get(&s->buffers_queued) >= 1);
 
     if (s->frame_size > 0 && buf.bytesused != s->frame_size) {
         av_log(ctx, AV_LOG_ERROR,
@@ -475,23 +484,53 @@ static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
     }
 
     /* Image is at s->buff_start[buf.index] */
-    pkt->data= s->buf_start[buf.index];
-    pkt->size = buf.bytesused;
-    pkt->pts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec;
-    pkt->destruct = mmap_release_buffer;
-    buf_descriptor = av_malloc(sizeof(struct buff_data));
-    if (buf_descriptor == NULL) {
-        /* Something went wrong... Since av_malloc() failed, we cannot even
-         * allocate a buffer for memcopying into it
-         */
-        av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n");
+    if (avpriv_atomic_int_get(&s->buffers_queued) == FFMAX(s->buffers / 8, 1)) {
+        /* when we start getting low on queued buffers, fallback to copying data */
+        res = av_new_packet(pkt, buf.bytesused);
+        if (res < 0) {
+            av_log(ctx, AV_LOG_ERROR, "Error allocating a packet.\n");
+            return res;
+        }
+        memcpy(pkt->data, s->buf_start[buf.index], buf.bytesused);
+
         res = ioctl(s->fd, VIDIOC_QBUF, &buf);
+        if (res < 0) {
+            av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF)\n");
+            av_free_packet(pkt);
+            return AVERROR(errno);
+        }
+        avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1);
+    } else {
+        struct buff_data *buf_descriptor;
 
-        return AVERROR(ENOMEM);
+        pkt->data     = s->buf_start[buf.index];
+        pkt->size     = buf.bytesused;
+#if FF_API_DESTRUCT_PACKET
+        pkt->destruct = dummy_release_buffer;
+#endif
+
+        buf_descriptor = av_malloc(sizeof(struct buff_data));
+        if (buf_descriptor == NULL) {
+            /* Something went wrong... Since av_malloc() failed, we cannot even
+             * allocate a buffer for memcpying into it
+             */
+            av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n");
+            res = ioctl(s->fd, VIDIOC_QBUF, &buf);
+
+            return AVERROR(ENOMEM);
+        }
+        buf_descriptor->fd    = s->fd;
+        buf_descriptor->index = buf.index;
+        buf_descriptor->s     = s;
+
+        pkt->buf = av_buffer_create(pkt->data, pkt->size, mmap_release_buffer,
+                                    buf_descriptor, 0);
+        if (!pkt->buf) {
+            av_freep(&buf_descriptor);
+            return AVERROR(ENOMEM);
+        }
     }
-    buf_descriptor->fd = s->fd;
-    buf_descriptor->index = buf.index;
-    pkt->priv = buf_descriptor;
+    pkt->pts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec;
 
     return s->buf_len[buf.index];
 }
@@ -517,6 +556,7 @@ static int mmap_start(AVFormatContext *ctx)
             return AVERROR(errno);
         }
     }
+    s->buffers_queued = s->buffers;
 
     type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
     res = ioctl(s->fd, VIDIOC_STREAMON, &type);
@@ -812,6 +852,10 @@ static int v4l2_read_close(AVFormatContext *s1)
 {
     struct video_data *s = s1->priv_data;
 
+    if (avpriv_atomic_int_get(&s->buffers_queued) != s->buffers)
+        av_log(s1, AV_LOG_WARNING, "Some buffers are still owned by the caller on "
+               "close.\n");
+
     mmap_close(s);
 
     close(s->fd);

libavformat/asfdec.c

@@ -1232,9 +1232,10 @@ static int ff_asf_parse_packet(AVFormatContext *s, AVIOContext *pb, AVPacket *pk
                            asf_st->ds_span);
                 } else {
                     /* packet descrambling */
-                    uint8_t *newdata = av_malloc(asf_st->pkt.size +
-                                                 FF_INPUT_BUFFER_PADDING_SIZE);
-                    if (newdata) {
+                    AVBufferRef *buf = av_buffer_alloc(asf_st->pkt.size +
+                                                       FF_INPUT_BUFFER_PADDING_SIZE);
+                    if (buf) {
+                        uint8_t *newdata = buf->data;
                         int offset = 0;
                         memset(newdata + asf_st->pkt.size, 0,
                                FF_INPUT_BUFFER_PADDING_SIZE);
@@ -1250,13 +1251,18 @@ static int ff_asf_parse_packet(AVFormatContext *s, AVIOContext *pb, AVPacket *pk
                                    asf_st->ds_chunk_size);
                             offset += asf_st->ds_chunk_size;
                         }
-                        av_free(asf_st->pkt.data);
-                        asf_st->pkt.data = newdata;
+                        av_buffer_unref(&asf_st->pkt.buf);
+                        asf_st->pkt.buf  = buf;
+                        asf_st->pkt.data = buf->data;
                     }
                 }
             }
             asf_st->frag_offset         = 0;
             *pkt                        = asf_st->pkt;
+#if FF_API_DESTRUCT_PACKET
+            asf_st->pkt.destruct        = NULL;
+#endif
+            asf_st->pkt.buf             = 0;
             asf_st->pkt.size            = 0;
             asf_st->pkt.data            = 0;
             asf_st->pkt.side_data_elems = 0;

libavformat/avformat.h

@@ -158,9 +158,9 @@
  * information will be in AVStream.time_base units, i.e. it has to be
  * multiplied by the timebase to convert them to seconds.
  *
- * If AVPacket.destruct is set on the returned packet, then the packet is
+ * If AVPacket.buf is set on the returned packet, then the packet is
  * allocated dynamically and the user may keep it indefinitely.
- * Otherwise, if AVPacket.destruct is NULL, the packet data is backed by a
+ * Otherwise, if AVPacket.buf is NULL, the packet data is backed by a
  * static storage somewhere inside the demuxer and the packet is only valid
  * until the next av_read_frame() call or closing the file. If the caller
  * requires a longer lifetime, av_dup_packet() will make an av_malloc()ed copy
@@ -1313,7 +1313,7 @@ int av_read_packet(AVFormatContext *s, AVPacket *pkt);
  * omit invalid data between valid frames so as to give the decoder the maximum
  * information possible for decoding.
  *
- * If pkt->destruct is NULL, then the packet is valid until the next
+ * If pkt->buf is NULL, then the packet is valid until the next
  * av_read_frame() or until av_close_input_file(). Otherwise the packet is valid
  * indefinitely. In both cases the packet must be freed with
  * av_free_packet when it is no longer needed. For video, the packet contains
@@ -1461,10 +1461,10 @@ int av_write_frame(AVFormatContext *s, AVPacket *pkt);
  * demuxer level.
  *
  * @param s media file handle
- * @param pkt The packet containing the data to be written. Libavformat takes
- * ownership of the data and will free it when it sees fit using the packet's
- * @ref AVPacket.destruct "destruct" field. The caller must not access the data
- * after this function returns, as it may already be freed.
+ * @param pkt The packet containing the data to be written. pkt->buf must be set
+ * to a valid AVBufferRef describing the packet data. Libavformat takes
+ * ownership of this reference and will unref it when it sees fit. The caller
+ * must not access the data through this reference after this function returns.
  * This can be NULL (at any time, not just at the end), to flush the
  * interleaving queues.
  * Packet's @ref AVPacket.stream_index "stream_index" field must be set to the

libavformat/avidec.c

@@ -980,7 +980,9 @@ static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
     AVIContext *avi = s->priv_data;
     AVIOContext *pb = s->pb;
     int err;
+#if FF_API_DESTRUCT_PACKET
     void* dstr;
+#endif
 
     if (CONFIG_DV_DEMUXER && avi->dv_demux) {
         int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
@@ -1081,10 +1083,16 @@ resync:
         }
 
         if (CONFIG_DV_DEMUXER && avi->dv_demux) {
+            AVBufferRef *avbuf = pkt->buf;
+#if FF_API_DESTRUCT_PACKET
             dstr = pkt->destruct;
+#endif
             size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
                                     pkt->data, pkt->size);
+#if FF_API_DESTRUCT_PACKET
             pkt->destruct = dstr;
+#endif
+            pkt->buf = avbuf;
             pkt->flags |= AV_PKT_FLAG_KEY;
             if (size < 0)
                 av_free_packet(pkt);

libavformat/flacdec.c

@@ -32,7 +32,8 @@ static int parse_picture(AVFormatContext *s, uint8_t *buf, int buf_size)
 {
     const CodecMime *mime = ff_id3v2_mime_tags;
     enum  AVCodecID      id = AV_CODEC_ID_NONE;
-    uint8_t mimetype[64], *desc = NULL, *data = NULL;
+    AVBufferRef *data = NULL;
+    uint8_t mimetype[64], *desc = NULL;
     AVIOContext *pb = NULL;
     AVStream *st;
     int type, width, height;
@@ -110,11 +111,11 @@ static int parse_picture(AVFormatContext *s, uint8_t *buf, int buf_size)
             ret = AVERROR_INVALIDDATA;
         goto fail;
     }
-    if (!(data = av_malloc(len))) {
+    if (!(data = av_buffer_alloc(len))) {
         ret = AVERROR(ENOMEM);
         goto fail;
     }
-    if (avio_read(pb, data, len) != len) {
+    if (avio_read(pb, data->data, len) != len) {
         av_log(s, AV_LOG_ERROR, "Error reading attached picture data.\n");
         if (s->error_recognition & AV_EF_EXPLODE)
             ret = AVERROR(EIO);
@@ -128,9 +129,9 @@ static int parse_picture(AVFormatContext *s, uint8_t *buf, int buf_size)
     }
 
     av_init_packet(&st->attached_pic);
-    st->attached_pic.data         = data;
+    st->attached_pic.buf          = data;
+    st->attached_pic.data         = data->data;
     st->attached_pic.size         = len;
-    st->attached_pic.destruct     = av_destruct_packet;
     st->attached_pic.stream_index = st->index;
     st->attached_pic.flags       |= AV_PKT_FLAG_KEY;
 
@@ -148,8 +149,8 @@ static int parse_picture(AVFormatContext *s, uint8_t *buf, int buf_size)
     return 0;
 
 fail:
+    av_buffer_unref(&data);
     av_freep(&desc);
-    av_freep(&data);
     av_freep(&pb);
     return ret;
 

libavformat/id3v2.c

@@ -420,7 +420,7 @@ finish:
 static void free_apic(void *obj)
 {
     ID3v2ExtraMetaAPIC *apic = obj;
-    av_freep(&apic->data);
+    av_buffer_unref(&apic->buf);
     av_freep(&apic->description);
     av_freep(&apic);
 }
@@ -476,9 +476,8 @@ static void read_apic(AVFormatContext *s, AVIOContext *pb, int taglen, char *tag
         goto fail;
     }
 
-    apic->len   = taglen;
-    apic->data  = av_malloc(taglen);
-    if (!apic->data || avio_read(pb, apic->data, taglen) != taglen)
+    apic->buf = av_buffer_alloc(taglen);
+    if (!apic->buf || avio_read(pb, apic->buf->data, taglen) != taglen)
         goto fail;
 
     new_extra->tag    = "APIC";
@@ -734,14 +733,13 @@ int ff_id3v2_parse_apic(AVFormatContext *s, ID3v2ExtraMeta **extra_meta)
         av_dict_set(&st->metadata, "comment", apic->type, 0);
 
         av_init_packet(&st->attached_pic);
-        st->attached_pic.data         = apic->data;
-        st->attached_pic.size         = apic->len;
-        st->attached_pic.destruct     = av_destruct_packet;
+        st->attached_pic.buf          = apic->buf;
+        st->attached_pic.data         = apic->buf->data;
+        st->attached_pic.size         = apic->buf->size;
         st->attached_pic.stream_index = st->index;
         st->attached_pic.flags       |= AV_PKT_FLAG_KEY;
 
-        apic->data = NULL;
-        apic->len  = 0;
+        apic->buf = NULL;
     }
 
     return 0;

libavformat/id3v2.h

@@ -67,8 +67,7 @@ typedef struct ID3v2ExtraMetaGEOB {
 } ID3v2ExtraMetaGEOB;
 
 typedef struct ID3v2ExtraMetaAPIC {
-    uint8_t     *data;
-    int          len;
+    AVBufferRef *buf;
     const char  *type;
     uint8_t     *description;
     enum AVCodecID id;

libavformat/matroskadec.c

@@ -1107,7 +1107,8 @@ static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
 static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
                                     AVPacket *pkt, uint64_t display_duration)
 {
-    char *line, *layer, *ptr = pkt->data, *end = ptr+pkt->size;
+    AVBufferRef *line;
+    char *layer, *ptr = pkt->data, *end = ptr+pkt->size;
     for (; *ptr!=',' && ptr<end-1; ptr++);
     if (*ptr == ',')
         layer = ++ptr;
@@ -1125,13 +1126,14 @@ static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
         es = ec/   100;  ec -=    100*es;
         *ptr++ = '\0';
         len = 50 + end-ptr + FF_INPUT_BUFFER_PADDING_SIZE;
-        if (!(line = av_malloc(len)))
+        if (!(line = av_buffer_alloc(len)))
             return;
-        snprintf(line,len,"Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n",
+        snprintf(line->data, len,"Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n",
                  layer, sh, sm, ss, sc, eh, em, es, ec, ptr);
-        av_free(pkt->data);
-        pkt->data = line;
-        pkt->size = strlen(line);
+        av_buffer_unref(&pkt->buf);
+        pkt->buf  = line;
+        pkt->data = line->data;
+        pkt->size = strlen(line->data);
     }
 }
 

libavformat/matroskaenc.c

@@ -90,7 +90,6 @@ typedef struct MatroskaMuxContext {
     mkv_cues        *cues;
     mkv_track       *tracks;
 
-    unsigned int    audio_buffer_size;
     AVPacket        cur_audio_pkt;
 
     int have_attachments;
@@ -969,7 +968,6 @@ static int mkv_write_header(AVFormatContext *s)
 
     av_init_packet(&mkv->cur_audio_pkt);
     mkv->cur_audio_pkt.size = 0;
-    mkv->audio_buffer_size  = 0;
 
     avio_flush(pb);
     return 0;
@@ -1180,19 +1178,6 @@ static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
     return 0;
 }
 
-static int mkv_copy_packet(MatroskaMuxContext *mkv, const AVPacket *pkt)
-{
-    uint8_t *data           = mkv->cur_audio_pkt.data;
-    mkv->cur_audio_pkt      = *pkt;
-    mkv->cur_audio_pkt.data = av_fast_realloc(data, &mkv->audio_buffer_size, pkt->size);
-    if (!mkv->cur_audio_pkt.data)
-        return AVERROR(ENOMEM);
-
-    memcpy(mkv->cur_audio_pkt.data, pkt->data, pkt->size);
-    mkv->cur_audio_pkt.size = pkt->size;
-    return 0;
-}
-
 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
 {
     MatroskaMuxContext *mkv = s->priv_data;
@@ -1219,7 +1204,7 @@ static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
     // check if we have an audio packet cached
     if (mkv->cur_audio_pkt.size > 0) {
         ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
-        mkv->cur_audio_pkt.size = 0;
+        av_free_packet(&mkv->cur_audio_pkt);
         if (ret < 0) {
             av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
             return ret;
@@ -1228,9 +1213,11 @@ static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
 
     // buffer an audio packet to ensure the packet containing the video
     // keyframe's timecode is contained in the same cluster for WebM
-    if (codec->codec_type == AVMEDIA_TYPE_AUDIO)
-        ret = mkv_copy_packet(mkv, pkt);
-    else
+    if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
+        mkv->cur_audio_pkt = *pkt;
+        mkv->cur_audio_pkt.buf = av_buffer_ref(pkt->buf);
+        ret = mkv->cur_audio_pkt.buf ? 0 : AVERROR(ENOMEM);
+    } else
         ret = mkv_write_packet_internal(s, pkt);
     return ret;
 }
@@ -1245,7 +1232,7 @@ static int mkv_write_trailer(AVFormatContext *s)
     // check if we have an audio packet cached
     if (mkv->cur_audio_pkt.size > 0) {
         ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
-        mkv->cur_audio_pkt.size = 0;
+        av_free_packet(&mkv->cur_audio_pkt);
         if (ret < 0) {
             av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
             return ret;
@@ -1282,7 +1269,6 @@ static int mkv_write_trailer(AVFormatContext *s)
     av_free(mkv->tracks);
     av_freep(&mkv->cues->entries);
     av_freep(&mkv->cues);
-    av_destruct_packet(&mkv->cur_audio_pkt);
 
     return 0;
 }

libavformat/mp3enc.c

@@ -343,7 +343,11 @@ static int mp3_write_packet(AVFormatContext *s, AVPacket *pkt)
                 return AVERROR(ENOMEM);
 
             pktl->pkt     = *pkt;
-            pkt->destruct = NULL;
+            pktl->pkt.buf = av_buffer_ref(pkt->buf);
+            if (!pktl->pkt.buf) {
+                av_freep(&pktl);
+                return AVERROR(ENOMEM);
+            }
 
             if (mp3->queue_end)
                 mp3->queue_end->next = pktl;

libavformat/mpegts.c

@@ -19,6 +19,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include "libavutil/buffer.h"
 #include "libavutil/crc.h"
 #include "libavutil/intreadwrite.h"
 #include "libavutil/log.h"
@@ -173,7 +174,7 @@ typedef struct PESContext {
     int64_t pts, dts;
     int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
     uint8_t header[MAX_PES_HEADER_SIZE];
-    uint8_t *buffer;
+    AVBufferRef *buffer;
     SLConfigDescr sl;
 } PESContext;
 
@@ -364,7 +365,7 @@ static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
         av_freep(&filter->u.section_filter.section_buf);
     else if (filter->type == MPEGTS_PES) {
         PESContext *pes = filter->u.pes_filter.opaque;
-        av_freep(&pes->buffer);
+        av_buffer_unref(&pes->buffer);
         /* referenced private data will be freed later in
          * avformat_close_input */
         if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
@@ -635,8 +636,8 @@ static void new_pes_packet(PESContext *pes, AVPacket *pkt)
 {
     av_init_packet(pkt);
 
-    pkt->destruct = av_destruct_packet;
-    pkt->data = pes->buffer;
+    pkt->buf  = pes->buffer;
+    pkt->data = pes->buffer->data;
     pkt->size = pes->data_index;
 
     if(pes->total_size != MAX_PES_PAYLOAD &&
@@ -793,7 +794,8 @@ static int mpegts_push_data(MpegTSFilter *filter,
                         pes->total_size = MAX_PES_PAYLOAD;
 
                     /* allocate pes buffer */
-                    pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
+                    pes->buffer = av_buffer_alloc(pes->total_size +
+                                                  FF_INPUT_BUFFER_PADDING_SIZE);
                     if (!pes->buffer)
                         return AVERROR(ENOMEM);
 
@@ -895,7 +897,7 @@ static int mpegts_push_data(MpegTSFilter *filter,
                 if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
                     new_pes_packet(pes, ts->pkt);
                     pes->total_size = MAX_PES_PAYLOAD;
-                    pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
+                    pes->buffer = av_buffer_alloc(pes->total_size + FF_INPUT_BUFFER_PADDING_SIZE);
                     if (!pes->buffer)
                         return AVERROR(ENOMEM);
                     ts->stop_parse = 1;
@@ -904,7 +906,7 @@ static int mpegts_push_data(MpegTSFilter *filter,
                     // not sure if this is legal in ts but see issue #2392
                     buf_size = pes->total_size;
                 }
-                memcpy(pes->buffer+pes->data_index, p, buf_size);
+                memcpy(pes->buffer->data + pes->data_index, p, buf_size);
                 pes->data_index += buf_size;
             }
             buf_size = 0;
@@ -1781,7 +1783,7 @@ static int handle_packets(MpegTSContext *ts, int nb_packets)
             if (ts->pids[i]) {
                 if (ts->pids[i]->type == MPEGTS_PES) {
                    PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
-                   av_freep(&pes->buffer);
+                   av_buffer_unref(&pes->buffer);
                    pes->data_index = 0;
                    pes->state = MPEGTS_SKIP; /* skip until pes header */
                 }

libavformat/mux.c

@@ -420,7 +420,10 @@ void ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt,
 
     this_pktl      = av_mallocz(sizeof(AVPacketList));
     this_pktl->pkt = *pkt;
+#if FF_API_DESTRUCT_PACKET
     pkt->destruct  = NULL;           // do not free original but only the copy
+#endif
+    pkt->buf       = NULL;
     av_dup_packet(&this_pktl->pkt);  // duplicate the packet if it uses non-alloced memory
 
     if (s->streams[pkt->stream_index]->last_in_packet_buffer) {

libavformat/mxg.c

@@ -168,7 +168,10 @@ static int mxg_read_packet(AVFormatContext *s, AVPacket *pkt)
 
                 pkt->pts = pkt->dts = mxg->dts;
                 pkt->stream_index = 0;
+#if FF_API_DESTRUCT_PACKET
                 pkt->destruct = NULL;
+#endif
+                pkt->buf  = NULL;
                 pkt->size = mxg->buffer_ptr - mxg->soi_ptr;
                 pkt->data = mxg->soi_ptr;
 
@@ -206,7 +209,10 @@ static int mxg_read_packet(AVFormatContext *s, AVPacket *pkt)
                     /* time (GMT) of first sample in usec since 1970, little-endian */
                     pkt->pts = pkt->dts = AV_RL64(startmarker_ptr + 8);
                     pkt->stream_index = 1;
+#if FF_API_DESTRUCT_PACKET
                     pkt->destruct = NULL;
+#endif
+                    pkt->buf  = NULL;
                     pkt->size = size - 14;
                     pkt->data = startmarker_ptr + 16;
 

libavformat/psxstr.c

@@ -201,6 +201,10 @@ static int str_read_packet(AVFormatContext *s,
                     *ret_pkt = *pkt;
                     pkt->data= NULL;
                     pkt->size= -1;
+                    pkt->buf = NULL;
+#if FF_API_DESTRUCT_PACKET
+                    pkt->destruct = NULL;
+#endif
                     return 0;
                 }
 

libavformat/rmdec.c

@@ -678,6 +678,10 @@ static int rm_assemble_video_frame(AVFormatContext *s, AVIOContext *pb,
         *pkt= vst->pkt;
         vst->pkt.data= NULL;
         vst->pkt.size= 0;
+        vst->pkt.buf = NULL;
+#if FF_API_DESTRUCT_PACKET
+        vst->pkt.destruct = NULL;
+#endif
         if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
             memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,
                 vst->videobufpos - 1 - 8*vst->slices);

libavformat/rtpdec.c

@@ -864,11 +864,15 @@ int ff_parse_fmtp(AVStream *stream, PayloadContext *data, const char *p,
 
 int ff_rtp_finalize_packet(AVPacket *pkt, AVIOContext **dyn_buf, int stream_idx)
 {
+    int ret;
     av_init_packet(pkt);
 
     pkt->size         = avio_close_dyn_buf(*dyn_buf, &pkt->data);
     pkt->stream_index = stream_idx;
-    pkt->destruct     = av_destruct_packet;
-    *dyn_buf          = NULL;
+    *dyn_buf = NULL;
+    if ((ret = av_packet_from_data(pkt, pkt->data, pkt->size)) < 0) {
+        av_freep(&pkt->data);
+        return ret;
+    }
     return pkt->size;
 }

libavformat/rtpdec_qt.c

@@ -186,12 +186,14 @@ static int qt_rtp_parse_packet(AVFormatContext *s, PayloadContext *qt,
         memcpy(qt->pkt.data + qt->pkt.size, buf + avio_tell(&pb), alen);
         qt->pkt.size += alen;
         if (has_marker_bit) {
-            *pkt = qt->pkt;
+            int ret = av_packet_from_data(pkt, qt->pkt.data, qt->pkt.size);
+            if (ret < 0)
+                return ret;
+
             qt->pkt.size = 0;
             qt->pkt.data = NULL;
             pkt->flags        = flags & RTP_FLAG_KEY ? AV_PKT_FLAG_KEY : 0;
             pkt->stream_index = st->index;
-            pkt->destruct     = av_destruct_packet;
             memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
             return 0;
         }

libavformat/utils.c

@@ -464,16 +464,20 @@ static AVPacket *add_to_pktbuf(AVPacketList **packet_buffer, AVPacket *pkt,
     return &pktl->pkt;
 }
 
-static void queue_attached_pictures(AVFormatContext *s)
+static int queue_attached_pictures(AVFormatContext *s)
 {
     int i;
     for (i = 0; i < s->nb_streams; i++)
         if (s->streams[i]->disposition & AV_DISPOSITION_ATTACHED_PIC &&
             s->streams[i]->discard < AVDISCARD_ALL) {
             AVPacket copy = s->streams[i]->attached_pic;
-            copy.destruct = NULL;
+            copy.buf      = av_buffer_ref(copy.buf);
+            if (!copy.buf)
+                return AVERROR(ENOMEM);
+
             add_to_pktbuf(&s->raw_packet_buffer, &copy, &s->raw_packet_buffer_end);
         }
+    return 0;
 }
 
 int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options)
@@ -535,7 +539,8 @@ int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputForma
         goto fail;
     ff_id3v2_free_extra_meta(&id3v2_extra_meta);
 
-    queue_attached_pictures(s);
+    if ((ret = queue_attached_pictures(s)) < 0)
+        goto fail;
 
     if (s->pb && !s->data_offset)
         s->data_offset = avio_tell(s->pb);
@@ -1074,8 +1079,12 @@ static int parse_packet(AVFormatContext *s, AVPacket *pkt, int stream_index)
         }
 
         if (out_pkt.data == pkt->data && out_pkt.size == pkt->size) {
+            out_pkt.buf   = pkt->buf;
+            pkt->buf      = NULL;
+#if FF_API_DESTRUCT_PACKET
             out_pkt.destruct = pkt->destruct;
             pkt->destruct = NULL;
+#endif
         }
         if ((ret = av_dup_packet(&out_pkt)) < 0)
             goto fail;
@@ -1735,7 +1744,7 @@ int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int f
     int ret = seek_frame_internal(s, stream_index, timestamp, flags);
 
     if (ret >= 0)
-        queue_attached_pictures(s);
+        ret = queue_attached_pictures(s);
 
     return ret;
 }
@@ -1751,7 +1760,7 @@ int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int
         ret = s->iformat->read_seek2(s, stream_index, min_ts, ts, max_ts, flags);
 
         if (ret >= 0)
-            queue_attached_pictures(s);
+            ret = queue_attached_pictures(s);
         return ret;
     }